The key events in the evolution of eukaryotes were the acquisition of the nucleus, the endomembrane system, and mitochondria. ~ American evolutionary biologist David Baum & American cytologist Buzz Baum
Eukaryotes arose from an evolutionary combination of prokaryotes. The partnership proved so winning that it established an environmentally dominant domain of life.
All multicellular organisms are eukaryotes. Plants and animals are eukaryotic.
While eukaryotic cells have a more elaborate structure, basic cell functioning of prokaryotes and eukaryotes is similar.